diff --git a/core/net/rime/polite-announcement.c b/core/net/rime/polite-announcement.c
index c47a3e08c..761322fad 100644
--- a/core/net/rime/polite-announcement.c
+++ b/core/net/rime/polite-announcement.c
@@ -33,7 +33,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: polite-announcement.c,v 1.6 2009/11/08 19:40:17 adamdunkels Exp $
+ * $Id: polite-announcement.c,v 1.7 2010/01/18 21:27:21 adamdunkels Exp $
  */
 
 /**
@@ -117,17 +117,18 @@ send_adv(clock_time_t interval)
 static void
 adv_packet_received(struct ipolite_conn *ipolite, const rimeaddr_t *from)
 {
-  struct announcement_msg *adata = packetbuf_dataptr();
+  struct announcement_msg adata;
   int i;
 
+  memcpy(&adata, packetbuf_dataptr(), sizeof(struct announcement_msg));
   PRINTF("%d.%d: adv_packet_received from %d.%d with %d announcements\n",
 	 rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
-	 from->u8[0], from->u8[1], adata->num);
+	 from->u8[0], from->u8[1], adata.num);
 
-  for(i = 0; i < adata->num; ++i) {
+  for(i = 0; i < adata.num; ++i) {
     announcement_heard(from,
-		       adata->data[i].id,
-		       adata->data[i].value);
+		       adata.data[i].id,
+		       adata.data[i].value);
   }
 }
 /*---------------------------------------------------------------------------*/